ns2.canon.net has no CNAME records.
Question and response
Question
dig ns2.canon.net. NS
Answer
The response has no answer records.
Authority
canon.net. 10800 SOA 01.dnsv.jp. hostmaster.dnsv.jp. 1676243909 3600 900 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0